dongjoon-hyun opened a new pull request #30258:
URL: https://github.com/apache/spark/pull/30258


   ### What changes were proposed in this pull request?
   
   This is a backport of https://github.com/apache/spark/pull/30066 .
   
   This PR aims to use a pre-built image for Github Action SparkR job.
   
   ### Why are the changes needed?
   
   This will reduce the execution time and the flakiness.
   
   **BEFORE (21 minutes 39 seconds)**
   ![Screen Shot 2020-10-16 at 1 24 43 
PM](https://user-images.githubusercontent.com/9700541/96305593-fbeada80-0fb2-11eb-9b8e-86d8abaad9ef.png)
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Pass the GitHub Action `sparkr` job in this PR.


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